Joel Greenblatt's position in Interdigital is currently worth $3.52 Million. That's 0.06% of their equity portfolio (397th largest holding). The first Interdigital trade was made in Q4 2010. Since then Joel Greenblatt bought shares 25 more times and sold shares on 24 occasions. The stake costed the investor $2.63 Million, netting the investor a gain of 34% so far.